Gentlemen,
I'd usually agree with you, but Hammer machine presses are in fact superior to DBs in DC training because of the rest-pauses. The main reason is struggling to get the 'bells back into position with each rest-pause "mini-set"--especially when you're moving some pretty heavy iron--will waste a ton of energy and rob you of "extra reps." For example:
You do a set of incline DB press with a pair of 130s for 10 reps to failure (I know, I know, but that's what DC training calls for

). Now, you have to set them down, stand up, take 15 deep breaths, then get back on the bench and swing the DBs
back up.
Wiped as you no doubt are, getting them to your chest will be hard enough, but now you need to crank out a few more reps. You'll probably be lucky to get 1--
maybe 2, but I really doubt it.
Same drill once more. Put the 'bells down and 15 deep breaths, then back into position. Getting the DBs in play will be a real struggle now, and it'll be a small miracle if you can squeeze out just
one more repetition.
That's 11-13 reps, max.
Compare that to how you might've done on the Iso-Incline. Say you get 10 reps with 360, fail, and do the breathing thing. When you take another stab at that weight, you'll probably be able to knock out 3-4 on the first rest-pause, and 1-2 on the last.
That's 14-16 reps.
Moreover, when it comes time to nail one of those inclines again, what'll be easier: to go up to 135 lb. DBs or toss an extra 2.5 or 5 on either side of the machine? The latter, of course. You should be able to add weight to the machine for several workouts without much trouble.
That said, Dante (Doggcrapp) does like DB presses, but he maintains that
if you do them on his routine, you should raise the rep range such that you're rest-pausing something like 20-30 reps total; e.g.,
You get 15 reps
You rest-pause 4 more
You rest pause 2 more
15+4+2= 21 rest-paused total
Since you'd be using lighter weights, that would evidently help you not waste as much energy just trying to get them into position. But for anyone who wants to stick to the standard 11-15 reps rest-paused, it's much, much easier to use machines and barbells.